---
title: ToolbarVerticalCompressionBehavior
framework: SwiftUI
role: symbol
role_heading: Structure
platforms: [iOS 27.1+, iPadOS 27.1+]
path: swiftui/toolbarverticalcompressionbehavior
---

# ToolbarVerticalCompressionBehavior

A behavior that determines how bars compress when the system places different types of bars together and space is constrained.

## Declaration

```swift
struct ToolbarVerticalCompressionBehavior
```

## Overview

Overview Use this with the toolbarVerticalCompressionBehavior(_:) modifier to control which items compress first when space is limited.

## Topics

### Getting compression behavior options

- [automatic](swiftui/toolbarverticalcompressionbehavior/automatic.md)
- [prefersTabBar](swiftui/toolbarverticalcompressionbehavior/preferstabbar.md)
- [prefersToolbarItems](swiftui/toolbarverticalcompressionbehavior/preferstoolbaritems.md)

## Relationships

### Conforms To

- [Equatable](swift/equatable.md)
- [Hashable](swift/hashable.md)
- [Sendable](swift/sendable.md)
- [SendableMetatype](swift/sendablemetatype.md)

## See Also

### Configuring vertical toolbar behavior

- [toolbarVerticalBehavior(_:)](swiftui/view/toolbarverticalbehavior(_:).md)
- [ToolbarVerticalBehavior](swiftui/toolbarverticalbehavior.md)
- [toolbarVerticalCompressionBehavior(_:)](swiftui/view/toolbarverticalcompressionbehavior(_:).md)